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Properties of substance:

potassium tetrasulfide

Group of substances:

inorganic

Physical appearance:

reddish brown rhombic crystals

Empirical formula (Hill's system for organic substances):

K2S4

Structural formula as text:

K2S4

Molar/atomic mass: 206.46

Melting point (°C):

159

Decomposition temperature (°C):

850

Solubility (g/100 g of solvent):

ethanol: soluble [Ref.]
water: soluble [Ref.]

Reactions of synthesis:

  1. [Ref.1aster]
    K2S + 3S → K2S4

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

-472 (s)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

210 (s)

Molar enthalpy (heat) of fusion ΔfusH (kJ/mol):

8.3

References:

  1. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 132-133 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru